我正在为我的决赛项目制作一个数据库清单程序。我真的是C ++的新手，到目前为止，这是我的代码：

#include <iostream>
#include <fstream>
#include <string>
#define ss 30
using namespace std;

struct store 
{
    char brand[30];
    char name[30];
    char pc[30];
    int x;
    float price;
}s[ss];
void AddNewItem(int &num)
{
    cout<<"\n \t\t\t   NEW DATA FOR AN ITEM\n\n\n";
    cout<<"Product Code: ";
    cin>>s[num].pc;
    cout<<endl;
    cout<<"Company Name: ";
    cin>>s[num].brand;
    cout<<endl;
    cout<<"Product Name: ";
    cin>>s[num].name;
    cout<<endl;
    cout<<"Product Price ";
    cin>>s[num].price;
    cout<<endl;
    cout<<"Quantity: ";
    cin>>s[num].x;
    num++;
    cout<<endl;
}
void ShowInventoryList(int &num)
{
    if (num==0)
    {
        cout<<"\nThere are no items in the record right now. Please add record.\n\n";
    }
    else{
        cout<<"\n \t\t\t LIST OF ALL ITEMS"<<endl;
        cout<<"Product Code \t Company Name \t Product Name \t Product Price \t Quantity'\t" <<endl;
        for(int i=0;i<num;i++)
        {
            cout<<s[i].pc <<"\t\t"
            <<s[i].brand <<"\t\t"
            <<s[i].name <<"\t\t"
            <<s[i].price <<"\t\t"
            <<s[i].x <<"\t\t"
            <<endl
            <<endl;
        }
    }
}

int main()
{
    ifstream openFile("Inventory.txt");
    string line;
    int menu,number=0;
    do
    {
        cout<<"\n====================   MENU   ====================";
        cout<<"\n                                                ";
        cout<<"\n            1. Add New Item                       ";
        cout<<"\n            2. Show Inventory List                ";
        cout<<"\n            3. Search An item From Record         ";
        cout<<"\n            4. Reduce The Quantity of An Item;    ";
        cout<<"\n            5. Save Item Stock to Text File       ";
        cout<<"\n            6. Show Item Stock from Text File     ";
        cout<<"\n            7. Exit                               ";
        cout<<"\n                                                ";
        cout<<"\n=================================================="<<endl;
        cout<<"\nEnter your choice: ";
        cin>>menu;
        switch(menu)
        {
            case 1:{AddNewItem(number);
                break;}
            case 2:{ShowInventoryList(number);
                break;}

            }
        }
    while(menu!=7);
    cout<<"\nThank you for using our program. Have a good day!";
}

我将物料的数量设为int的原因是，我计划仅询问用户他们要从物料中减少的数量，并从物料的原始数量中减去该数量。我被困在这里，我将非常感谢您的帮助！